Treadmill Therapy Rewires Brain
Treadmill exercise may help stroke survivors regain their ability to walk by rewiring parts of the brain responsible for controlling balance and motor skills to compensate for stroke damage, researchers report in Stroke: Journal of the American Heart Association.
In a randomized, controlled study, patients with long term disability after stroke who did six months of treadmill exercise training increased their activity in certain parts of the brain by 72 percent on imaging tests. Brain activity changes did not occur in patients who did stretching exercise. The treadmill group also increased their walking velocity and their fitness more than those in the stretching group.
“Revealing a mechanism by which treadmill therapy improves a stroke survivor’s gait was the novel goal of the study,” said Andreas Luft, M.D., one of the study’s lead authors and a professor of clinical neurology and neurorehabilitation in the Department of Neurology at the University of Zurich in Switzerland. “This study provides the first evidence of increased activation in cortical and subcortical circuitry produced by treadmill exercise training in stroke survivors.”
In the study conducted at the University of Maryland and Baltimore Veterans Affairs Medical Center, researchers compared 37 patients who performed “progressive task repetitive treadmill therapy” to 34 patients who did stretching to determine which could improve walking among stroke survivors with chronic partial paralysis on one side of the body. They found:
• The stroke survivors who used the treadmill for six months benefited significantly more than those who used stretching for a comparable period.
• The treadmill group increased its peak treadmill walking velocity by 51 percent compared to the stretching group’s 11 percent, and it increased its average over-ground walking velocity during six minutes by 19 percent compared to the stretching group’s 8 percent.
• Cardiorespiratory fitness in the treadmill group increased 18 percent but decreased 3 percent in the stretching group.
Researchers compared functional magnetic resonance images (fMRI) of participants’ brains while participants did knee-flexing exercises that mimic walking. The fMRIs showed increased blood oxygenation and flow in the brainstem and cerebellum of the stroke survivors who had used the treadmill but not in those who did stretching.
Researchers said the increases in blood oxygenation and flow indicated that the cerebellum and brainstem had been “recruited” to replace some of the walking functions of the cortical brain that had been damaged by the strokes.